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Trigger various actions on a running zope via a USR1 signal

Project description


This package allows one to perform various debugging and development actions on a running Zope instance. In order to perform an action one must:

  1. Insert a command into a special control file. To determine which file to look in, mr.freeze will take the Zope pid file and replace the extension with ‘.freeze’. So in a typical buildout the control file would be var/instance.freeze

  2. Send a USR1 signal to the Zope instance.

This pattern is intended to support integration with editors like TextMate and emacs, but that hasn’t been implemented yet.


The following commands are currently supported in both debug and non-debug mode.


Will dump a stack backtrace for all threads to the console. (Default command if unable to read freeze file.)


Will dump a pony to the console.

The following commands are supported in debug mode only.


Will drop Zope to a pdb debug prompt.

freeze [file] [line #]

Will set a pdb breakpoint on the specified line.

The following commands are planned.

reload code

Will reload code that has been modified.

reload zcml

Will reload code and ZCML that has been modified.

Editor integration

Please see r82128 for some preliminary information regarding TextMate integration or watch the quick demo screen cast.


  • David Glick (ONE/Northwest)

Thanks to those who have helped provide the foundation for this package:

  • Products.signalstack: Wichert Akkerman

  • Products.PDBDebugMode: Ross Patterson

  • z3c.deadlockdebugger: Malthe Borch

  • DeadlockDebugger: Florent Guillaume

  • threadframe: Fazal Majid


1.0a1 (2009-03-12)

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